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1
Followell, Timothy B. "Effect of Dental Treatment on Parental Stress as Measured by the Parenting Stress Index." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276567183.
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Chan, Chi-lap Samuel. "Caries prevalence and feeding habits of toddlers in Hong Kong." Click to view the E-thesis via HKUTO, 1999. http://sunzi.lib.hku.hk/HKUTO/record/B38628375.
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Luxford, Yvonne School of History & Philosophy of Science UNSW. "Was the Tooth Fairy breast fed? The politics of infant tooth decay." Awarded by:University of New South Wales. School of History and Philosophy of Science, 2006. http://handle.unsw.edu.au/1959.4/25224.
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In the mid 1970s American paediatric dentists started publishing claims that breast feeding an infant on demand and/or during the night was as dangerous to the infant's dental health, in terms of the production of caries, as the previously established dangers of Baby Bottle Tooth Decay. It was argued by some dentists that this danger increased if the infant was breast fed for an extended period of time. Such claims have gained support from many dentists, and their professional bodies, into the twenty-first century. This thesis examines the historical, social, commercial and cultural influences that supported the development of such assertions. It analyses the ways in which expert reinforcement was gained, and scrutinises the scientific controversy as publicly fought in professional journals and other outlets. The thesis also examines the growing status of the dental profession, especially in connection with its claim to specialised scientific and medical knowledge in the production of dental caries. Further, consideration is given to the medicalisation of breast feeding and the associated commercial infant feeding dispute. The thesis attempts to redress the current lack of theoretical analysis of the construction of dental knowledge. To date there has been minimal academic contribution to the history of dentistry; however, the absence of extensive analysis has been advantageous in enabling an original approach to the material.
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Haj-Ali, Reem Spencer Paulette. "Adhesive diffusion into caries-affected dentin under simulated oral conditions." Diss., UMK access, 2004.
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Thesis (M.S.)--School of Dentistry. University of Missouri--Kansas City, 2004."A thesis in oral biology." Advisor: Paulette Spencer. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Feb. 24, 2006. Includes bibliographical references (leaves 58-65). Online version of the print edition.
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MULLER, KARIN P. "Efeitos da radiacao laser em baixa intensidade na prevencao da carie dental induzida em ratos." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11210.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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OLIVEIRA, MARCELLA E. "Potencial de inibição da progressão de cárie artificial por irradiação sub-ablativa com laser de COsub(2) pulsado em esmalte dental bovino." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11288.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
7
Amaechi, Bennett Tochukwu. "Studies relating to the development and progression of enamel lesions : caries and erosion." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366453.
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Stecksén-Blicks, Christina. "Epidemiological studies of dental caries in groups of Swedish children." Doctoral thesis, Umeå universitet, Pedodonti, 1986. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-100548.
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In a cross-sectional study the extent and distribution of dental caries was studied in 817 children, 4, 8 and 13 years old in three areas inSweden. The importance of dietary habits, sugar intake, social conditions, professional dental care, oral hygiene and the use of fluorides on caries prevalence was analyzed. In a subsample, consisting of 88 8-year-olds and 91 13-year-olds the net caries increment during aone-year period was studied.In this longitudinal study, the salivary levels of lactobacllli and S. mutans were determined and correlated to sugar intake and caries increment. The cross-sectional study showed obvious differences in caries prevalence among the studied areas. These differences could mainly be explained by variations in the age from which children had received professional dental care, frequency of tooth-brushing and the use of topical fluorides. There were no differences in dietary habits or sugar intake that could explain the differences in caries prevalence among the areas studied. Examples are given of how changes in some determinants may affect the caries prevalence by means of path analysis. The longitudinal study showed that caries Increment was higher when sugar intake and meal frequency were high (> the mean value for the age group). The highest mean caries increment was found in children with high prevalence of lactobacllli and S. mutans in the saliva combined with a high sugar intake. Groups of children with high salivary levels of both Iactobac ì II i and S. mutans developed 3-4 times more caries than other children. This relation did not always exist in the Individual case. Children with a low caries Increment during one year (0-2 surfaces) brushed their teeth more often and rinsed their mouths more frequently with fluoride solution than children with a high caries increment (> 3 surfaces). The use of fluoridated toothpaste was somewhat more common, however, in the low carles increment group only in the.8-year-oIds. The gingival status was used as a measure of oral hygiene and gingivitis scores revealed statistically significant differences between groups with a low caries increment and a high carles increment (p < 0.01, p < 0.05) in the two age groups, respectively. With the variables frequency of meals, total sugar intake, salivary level of lactobacilli and S. mutans, oral hygiene and use of topical fluorides the net caries increment during one year could be correctly predicted in 79 % of the 8-year-olds and 81 % of the 13-year-olds when the children were divided Into two groups according to their net caries increment; 0-2 surfaces and > 3 surfaces.S. 1-43: sammanfattning, s. 45-116: 5 uppsatser
digitalisering@umu
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Jacobs, Theodore Konrad. "The prevalence of early childhood caries in the Southern Cape Karoo region." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5670_1189599008.
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Dental caries is a huge problem among the previously disadvantaged population. Early childhood caries is a problem with infants. This thesis contained information concerning the parents knowledge about their children's oral health and their own personal details. These children were all in the age group 2-5 years. The study findings suggest that parent and parents-to-be, need to be informed on oral health issues concerning their children. This should not solely be the task of dentists but other health care workers as well.
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Buchanan, Susan. "Effect Of Chemical Agents On Acid Production In, And The Microbial Content Of, Pits And Fissures." University of Sydney, 1988. http://hdl.handle.net/2123/4967.
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Master of Dental SurgeryThis work was digitised and made available on open access by the University of Sydney, Faculty of Dentistry and Sydney eScholarship . It may only be used for the purposes of research and study. Where possible, the Faculty will try to notify the author of this work. If you have any inquiries or issues regarding this work being made available please contact the Sydney eScholarship Repository Coordinator - ses@library.usyd.edu.au
11
Zhang, Wen. "A randomized controlled clinical trial of oral health promotion strategies to prevent and arrest root caries among Hong Kong's eldering." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43278498.
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Todryk, Stephen Martin. "The antigenicity and immunogenicity of T and B cell epitopes expressed by a streptococcal antigen." Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338702.
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Yeslam, Hanin E. "The effect of acid etching on remineralization of incipient caries lesions : a micro-ct study /." Connect to resource online, 2009. http://hdl.handle.net/1805/2084.
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Thesis (M.S.D.)--Indiana University School of Dentistry, 2009.Title from PDF t. p. (viewed Feb. 10, 2010) Advisor(s): Masatoshi Ando, Chair of the Research Committee, Carlos Gonzalez-Cabezas, Melvin Lund, Tien-Min Gabriel Chu, Michael Cochran. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 64-70).
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Rodrigues, Cecile Soriano. "Dietary guidelines, sugar intake and caries increment : a study in Brazilian nursery school children." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267833.
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鄭存革 and Cunge Zheng. "Relationship between dental caries in the primary teeth and developmental defects of enamel in the permanent successors." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B30331109.
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Khaddam, Mayssam. "Role of EMMPRIN and MMPs in tooth development, dental caries and pulp-dentin regeneration." Thesis, Paris 5, 2014. http://www.theses.fr/2014PA05T046/document.
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Le développement dentaire est orchestré par une série de signalisations inductives réciproques entre l'épithélium dentaire et le mésenchyme, qui conduit à la formation de la dentine et de l'émail. EMMPRIN/CD147 est un INducteur des MetalloPRoteinases de la Matrice Extracellulaire (MMPs) qui régule les interactions épithélio-mésenchymateuses dans le cancer et d'autres processus pathologiques et est exprimé lors du développement dentaire. Ainsi, nous avons utilisé des souris KO pour EMMPRIN pour déterminer le rôle d'EMMPRIN dans la formation des tissus dentaires. Nous avons démontré que l’absence d’EMMPRIN conduisait dans le germe dentaire à une diminution de l’expression de MMP-3 et de MMP-20, à un retard de la dégradation de la membrane basale, à un retard de la formation de l’émail bien visible dans l'incisive à croissance continue, à une diminution du volume et de l'épaisseur d'émail, mais à une maturation amélaire normale. Ces résultats indiquent qu'EMMPRIN est impliqué dans le dialogue épithélio-mésenchymateuse pendant le développement dentaire, principalement par la régulation de l'expression de certaines MMPS. Nous avons ensuite essayé d'évaluer le rôle potentiel d'EMMPRIN dans le processus de réparation dentaire en comparant la cicatrisation de blessures pulpaires des souris KO pour EMMPRIN à des souris WT. Enfin, dans un souci de transfert vers la clinique, nous avons évalué la capacité d’extraits de pépin de raisin (connu pour être des inhibiteurs naturels de MMPs) à empêcher la dégradation de la matrice dentinaire humaine déminéralisée et traitée par MMP-3Tooth development is regulated by a series of reciprocal inductive signalings between the dental epithelium and mesenchyme, which culminates with the formation of dentin and enamel. EMMPRIN/CD147 is an Extracellular Matrix MetalloPRoteinase (MMP) INducer that mediates epithelial-mesenchymal interactions in cancer and other pathological processes and is expressed in developing teeth. Here we used EMMPRIN knockout (KO) mice to determine the functional role of EMMPRIN on dental tissues formation. We demonstrated that EMMPRIN deficiency results in decreased in MMP-3 and MMP-20 expressions, delayed in basement membrane degradation in tooth germ, delayed in enamel formation well distinguishable in incisor, and in decreased enamel volume and thickness but normal maturation. These results indicate that EMMPRIN is involved in the epithelial-mesenchymal cross-talk during tooth development by regulating the expression of MMPs. Then we tried to investigate the potential role of EMMPRIN in the pulp dentin repair process by comparing the healing of injured pulps of EMMPRIN KO and WT mice. Finally, we evaluated the capacity of grape-seed extracts (known to be natural inhibitors of MMPs and used in new daily mouthrinse) to prevent the degradation of human demineralized dentin matrix by MMP-3
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Soe, Ko Ko. "Dental caries, related treatment need and oral health related quality of life in Myanmar adolescents." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326061.
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Pena, William A. "Optical imaging of early dental caries in deciduous teeth with near-IR light at 1310nm." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1465488.
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Bergdoll, Allison S. "Icon caries infiltrant resin and MI Paste Plus for the treatment of white spot lesions." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2010. https://www.mhsl.uab.edu/dt/2010m/bergdoll.pdf.
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Ghaedi, Leila. "AN AUTOMATED DENTAL CARIES DETECTION AND SCORING SYSTEM FOR OPTIC IMAGES OF TOOTH OCCLUSAL SURFACE." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3548.
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Dental caries are one of the most prevalent chronic diseases. Worldwide 60 to 90 percent of school children and nearly 100 percent of adults experienced dental caries. The management of dental caries demands detection of carious lesions at early stages. The research of designing diagnostic tools in caries has been at peak for the last decade. This research aims to design an automated system to detect and score dental caries according to the International Caries Detection and Assessment System (ICDAS) guidelines using the optical images of the occlusal tooth surface. There have been numerous works that address the problem of caries detection by using new imaging technologies or advanced measurements. However, no such study has been done to detect and score caries with the use of optical images of the tooth surface. The aim of this dissertation is to develop image processing and machine learning algorithms to address the problem of detection and scoring the caries by the use of optical image of the tooth surface.
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Elidrissi, Sitana Mustafa Idris. "Prevalence of dental caries and tooth brushing habits among preschool children in Khartoum State, Sudan." Thesis, University of the Western Cape, 2014. http://hdl.handle.net/11394/3905.
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>Magister Scientiae - MScThe aim of this study was to determine the prevalence of dental caries and tooth brushing habits among 3 to 5 year-olds preschool children in Khartoum state. Dental caries in preschool children remains a major dental public health problem as it affects significant number of preschool children in both developed and developing countries and it is on increase in the developing ones as in Sudan due to the change in life style with the absence of oral health preventive programs and inadequate access to oral health care
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Sulkala, M. (Merja). "Matrix metalloproteinases (MMPs) in the dentin-pulp complex of healthy and carious teeth." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514274598.
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Abstract
The dentin-pulp complex comprises mineralized dentin and the vital soft tissues encased inside dentin, i.e. odontoblasts and pulp tissue. During caries progression, the dentinal minerals are dissolved and eventually the collagenous organic matrix is degraded. However, the exact mechanisms and enzymes responsible for the organic matrix breakdown remain unknown. Matrix metalloproteinases (MMPs), a family of endopeptidases capable of degrading in concert virtually all extracellular matrix components, are expressed during normal dentin-pulp complex formation and maintenance. MMP activity has also been suggested to contribute to the organic matrix degradation during dentin caries progression and to the repair and defense reactions elicited by caries in the dentin-pulp complex cells. The aim of the study was to further elucidate the role of host MMPs in dentin caries progression and the origin of MMPs in carious dentin as well as the possible changes in MMP expression in the cells of the dentin-pulp complex in response to caries.
MMP inhibitors decreased the area of dentin caries lesions in vivo, suggesting the involvement of host MMPs in dentin caries pathogenesis. When the overall MMP gene expression was examined by cDNA microarray, pooled pulp samples demonstrated a high level of MMP-13 expression, but failed to show any unequivocal changes in MMP expression due to caries. MMP-13 expression is rare among normal human adult tissues. Real-time quantitative PCR of individual pulp and odontoblast samples demonstrated a rather large variation in relative MMP-13 mRNA expression between samples, especially pulp samples. Protein expression of MMP-13 was detected in pulp and odontoblasts without any major differences between the tissues of sound and carious teeth. This was also the case with the MMP-20 (enamelysin) protein, which was demonstrated in odontoblasts and the pulp tissue of fully developed human teeth. MMP-20, MMP-8, and gelatinases (especially MMP-2) were demonstrated in human dentin, and dentinal MMPs exhibited activity against native and denatured type I collagen when released.
The study demonstrates the presence of MMPs in the soft and hard tissue compartments of the dentin-pulp complex. These enzymes may also contribute to dentin caries progression and response reactions to caries.
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Bartkowski, Lindsey Marie. "The Association Between Household Food Security and Dental Caries in Young Children." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405461794.
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Chan, Chi-lap Samuel, and 陳自立. "Caries prevalence and feeding habits of toddlers in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B38628375.
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Al-Khateeb, Susan. "Studies on the remineralization of white spot lesions : longitudinal assessment with quantitative light-induced fluorescence /." Stockholm, 1998. http://diss.kib.ki.se/1998/19980331alkh.
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Mei, Lei, and 梅蕾. "Actions of chlorhexidine and silver diamine fluoride on cariogenic biofilm and root caries." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44900776.
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PAIVA, PRISCILA F. "Laser diagnostico e tratamento da carie dental: uma visao clinica." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10930.
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Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia)
IPEN/D-MPLO
Instituto de Pesquisas Energeticas e Nucleares, IPEN/CNEN-SP; Faculdade de Odontologia, Universidade de Sao Paulo
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Lee, Kwok-lun, and 李國綸. "The oral epidemiology of 45-64 year-old Chinese residents of a housingestate in Hong Kong: coronal and rootcaries." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B38628260.
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Al-Malik, Manal. "Development of an epidemiological index for primary anterior teeth affected by erosion and prevalence of dental erosion in pre-school Saudi children." Thesis, University College London (University of London), 2000. http://discovery.ucl.ac.uk/1318060/.
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Erosion affects both dentitions but has proved difficult to measure. It has been thought to affect children who are less susceptible to caries but previous studies have been confined to countries where caries prevalence is low. The aims of this study were first, to develop and then investigate the validity of an index to measure erosion in primary teeth. Secondly, to determine the prevalence of erosion in primary incisors amongst kindergarten children in Jeddah and its relationship to caries in the same children. Thirdly, to investigate determinants of erosion and caries in the sample. A sample of 41 exfoliated and extracted primary anterior teeth were scored visually and photographically and scores related to appearance on section. Erosion, caries and rampant caries were then measured in a sample of 987 children. The survey included a questionnaire to parents. Scores used in the index through visual inspection and photographs were related consistently to appearance of lost enamel on section. Sensitivity was 0.94 and specificity was 1.0. Kappa values for repeat assessments all exceeded 0.77. Thirty one percent of the children in the survey had evidence of erosion on clinical examination. For 186 this was confined to enamel but for 123 it involved dentine and/or pulp. Amongst the 727 who had readable photographs, 30% had erosion on photographic and 36% on clinical examination. Agreement was seen between the two methods for 93% of the surfaces included. Caries affected 720 (73%) of the children and rampant caries 336 (34%). More children with caries, (excluding rampant caries), had erosion (36%) than children who were caries free (27%). Vitamin C supplements, frequent use of carbonated drinks and the consumption of fruit syrup from a feeding bottle at bed/nap time as a baby were all related to erosion. These drinks were also related to caries but were part of a larger number of significant factors including socio-demographic measures and oral hygiene practices.
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Perlmuter, Judith Liberman. "Avaliação clínica de restaurações adesivas após remoção parcial de tecido cariado em dentes decíduos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/87158.
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O conhecimento atual sobre a etiopatogenia da doença cárie permite tratamentos mais conservadores. A técnica da remoção parcial de tecido cariado (RPTC) é um exemplo dessa nova abordagem, pois permite uma maior preservação da estrutura dentária e evita exposições pulpares. No entanto, pouco se conhece sobre as restaurações de resina composta após esse tratamento. O objetivo deste estudo foi avaliar o desempenho das restaurações de resina composta após a técnica de RPTC em comparação à RTTC após 36 meses de acompanhamento. O estudo envolveu 48 crianças de 3 a 8 anos, portadoras de lesões cariosas agudas profundas na superfície oclusal ou ocluso-proximal(is). No total, 120 dentes (65 RPTC e 55 RTTC) foram analisados. A randomização foi realizada através de sorteio. Um único avaliador treinado e calibrado avaliou a presença da perda total ou parcial das restaurações. As variáveis explicativas foram relacionadas ao desfecho através dos testes estatísticos de Regressão de Cox uni e multivariados (α=5%). A taxa total de sobrevida das restaurações foi de 69,5% após 36 meses. Para os grupos da RTTC e RPTC o sucesso foi de 81% e 57%, respectivamente (p=0,004). Observou-se uma menor taxa de sobrevida de restaurações em dentes com cavidades ocluso proximais (58%) comparadas às oclusais (87%), p=0,02. Os modelos de Regressão de Cox uni variados demonstraram que o tratamento e o tipo de cavidade tiveram influência estatisticamente significante na probabilidade de falha de restaurações ao longo de 36 meses. No modelo multivariado final foi observado que a realização de RPTC gerou uma probabilidade 3,44 vezes maior de falha da restauração ao longo de 36 meses comparada aos tratamentos convencionais (p=0,006). Com relação à atividade de cárie, 71% dos dentes aos 36 meses estavam em pacientes com atividade de cárie. A taxa de sobrevida foi de 63% para as restaurações em pacientes com atividade e de 80% naqueles sem atividade de cárie. A partir dos resultados, pôde-se concluir que realizar restaurações de resina composta após RPTC em dentes decíduos apresenta taxa de sucesso significativamente menor em relação a restaurações sobre RTTC após três anos de acompanhamento. As restaurações de cavidades envolvendo duas faces apresentaram um maior índice de falhas em comparação as de uma. A atividade de cárie do individuo não interferiu na longevidade da restauração.Current knowledge of the pathogenesis of caries allows more conservative treatments. The technique of partial caries removal (PCR) is an example of this new approach; it allows a greater preservation of tooth structure and prevents pulpal exposures. However, little is known about the composite resin restorations after treatment. The purpose of this study was to assess the follow-up performance of composite restorations after PCR technique compared to the TCR after 36 months. The study involved 48 children between 3-8 years old, with acute deep carious lesions on the occlusal or occlusal-proximal surface (s). In total, 120 teeth (65 PCR and 55 TCR) were analyzed. Randomization was performed by drawing lots. A single trained and calibrated examiner evaluated the presence of total or partial loss of restorations. The explanatory variables were related to the outcome through statistical tests Cox Regression univariate and multivariate (α = 5 %). The overall survival rate of the restorations was 69.5% after 36 months. For groups of TCR and PCR the success rate was 81% and 57%, respectively (p = 0.004). There was a lower survival rate of restoration in teeth with occlusal- proximal cavities (58%) compared to occlusal (87%), p = 0.02. The Cox Regression models univariate demonstrated that treatment and the type of cavity had a statistically significant influence on the probability of failure of restorations over 36 months. In the final multivariate model was observed that the performance of PCR generated a 3.44 times greater probability of failure of the restoration over 36 months compared to conventional treatments (p = 0.006). Regarding caries activity, 71% of teeth at 36 months were in patients with caries activity. The survival rate was 63 % for fillings in patients with activity and 80 % in those without caries activity. From the results, it was concluded that performing composite restorations in primary teeth after PCR has significantly lower success rate compared to TCR restorations after three years of monitoring. The restorations of cavities involving two sides had a higher failure rate compared to single surface. The caries activity of the individual did not affect the longevity of the restoration.
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Lindquist, Birgitta. "Mutans streptococci in human dentition some factors influencing colonization and distribution /." Göteborg : University of Göteborg, 1991. http://catalog.hathitrust.org/api/volumes/oclc/25383720.html.
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Zhang, Wen, and 張文. "A randomized controlled clinical trial of oral health promotion strategies to prevent and arrest root caries among Hong Kong'seldering." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43278498.
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Aratani, Monica. "Desempenho clinico e mecanico de adesivo auto-condicionante a dentina decidua afetada por carie." [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288181.
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Orientador: Mario Fernando de GoesDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O propósito deste trabalho foi estudar o efeito de métodos de contensão da mufla metálica (grampo convencional e sistema RS de contensão) e do tempo pós-prensagem (imediato e 6 horas) nos níveis de adaptação da base de prótese total superior confeccionada com as resinas acrílicas ativadas termicamente Clássico (Clássico) e QC-20 (Dentsply). Foram confeccionados 80 conjuntos modelo de gesso-base de cera distribuídos aleatoriamente em 8 grupos (n=10), de acordo com os métodos de contensão de mufla metálica e do tempo pós-prensagem. As resinas acrílicas foram proporcionadas e manipuladas de acordo com as instruções dos fabricantes e prensadas na fase plástica, com carga inicial de 850 kgf e final de 1250 kgf em prensa hidráulica de bancada. As bases confeccionadas em resina Clássico foram polimerizadas em ciclo de água a 74?C por 9 horas e as bases de resina QC-20 em água em ebulição por 20 minutos. Depois de esfriadas até atingir a temperatura ambiente, as bases foram desincluídas, acabadas, fixadas nos respectivos modelos de gesso com adesivo à base de cianoacrilato e seccionadas em três secções, correspondentes à distal de caninos, mesial de primeiros molares e região palatina posterior. Em cada secção, o desajuste entre modelo de gesso e base de resina foi verificado nos pontos referenciais fundo de sulco vestibular direito e esquerdo, crista do rebordo alveolar direito e esquerdo e linha mediana palatina posterior, com microscópio comparador linear Olympus, com precisão de 0,0005 mm. Os resultados coletados foram submetidos à análise de variância e ao teste de Tukey (5%). O dispositivo RS produziu níveis médios de adaptação com diferença estatística significante quando comparado com o grampo convencional, independente dos demais fatores. O dispositivo RS produziu níveis médios de adaptação nos tempos imediato e 6 horas com diferença estatística significante quando comparado com o grampo convencional. A polimerização imediata produziu valores entre cortes sem diferença estatística significativa quando comparada com a polimerização após 6 horas. Quando os cortes foram analisados no fator prensagem, os melhores níveis de adaptação foram obtidos com o dispositivo RS, com diferença estatística significativa quando comparado com o grampo convencional. Os tratamentos RS e convencional apresentaram comportamento semelhante, independente da resina, mas foram diferentes no tempo pós-prensagem. A região posterior apresentou maiores valores de desadaptação em ambas as resinas, independente do tipo de contensão da mufla e do tempo pós-prensagem
Abstract: The purpose of this study was to verify the effect of flask closure method (conventional clamp and RS tension system) and post-pressing time (immediate and after 6 hours) on the maxillary denture base adaptation made with Classico and QC-20 heat?cured acrylic resins. Eighty maxillary stone cast/wax base sets were made and randomly assigned into 8 groups (n=10) according to the flask closure method and post- pressing time. The acrylic resins were proportioned and manipulated following the manufacturer?s instructions and flask pressed in the doughlike stage with an initial load of 850 kgf and final load of 1,250 kgf in hydraulic press. Classico acrylic resin was submitted to polymerization in water at 74°C during 9 hours in immediate or after 6 hour post-pressing times. QC-20 acrylic resin was submitted to polymerization in boiling water for 20 minutes. After bench cooling the resin bases were deflasked, finished, and fixed on the casts with instantaneous adhesive. The cast-resin base sets were laterally sectioned in the regions corresponding to the distal of canines (A), mesial of first molars (B), and posterior palatal zone (C). The gap between the stone cast and resin base was measured with an Olympus comparative microscope with accuracy of 0.0005mm at five referential points for each section. Data submitted to ANOVA and Tukey?s test (5%) showed that the RS system produced medium levels of adaptation with statistically significant difference when compared to the conventional clamp, independent of the other factors. RS system produced levels of adaptation in the immediate and 6 hours post-pressing times with statistical significant difference when compared to the conventional clamp. The immediate polymerization produced values among cuts without statistical difference when compared to the polymerization after 6 hours. When the cuts were analyzed in the factor flask pressure method, the best levels of adaptation were showed with the RS system, with statistical significant difference when compared to the conventional clamp. The RS system and conventional clamp treatments showed similar results independent of the resin factor; however they were different in the post-pressing time. The posterior region showed greater values of desadaptation in both resins, independent of the flask closure method and post-pressing time
Mestrado
Doutor em Materiais Dentários
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Chen, Hongyan. "Insufficient Sleep and Incidence of Dental Caries in Deciduous Teeth among Children in Japan: A Population-Based Cohort Study." Kyoto University, 2019. http://hdl.handle.net/2433/243308.
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STREFEZZA, CLAUDIA. "Efeitos in vivo do laser de holmio em estrutura dental: monitoracao termica e analise histologica do tecido pulpar." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10899.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Oliveira, Renata Schlesner de. "Atividade de lesões de cárie não cavitadas : fatores associados e critérios de avaliação." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/143503.
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O objetivo geral desta pesquisa foi avaliar fatores associados à atividade de lesões de cárie não cavitadas, bem como, critérios para a sua avaliação em superfícies oclusais de molares permanentes. Para isso, dois estudos foram conduzidos. O primeiro estudo teve como objetivos: (1) avaliar a efetividade de um tratamento para pacientes com lesões de cárie em molares em diferentes estágios de erupção e (2) avaliar se o estágio de erupção e o acúmulo de biofilme estão associados à atividade de lesões de cárie em pacientes submetidos a um tratamento não invasivo. Já o segundo estudo teve como objetivo avaliar a associação entre dois critérios visuais para a determinação da atividade de lesões de cárie não cavitadas em molares permanentes. Para o primeiro estudo, foram selecionados 48 pacientes, com idades entre 5 e 13 anos, que apresentavam pelo menos um molar permanente com lesão não cavitada ativa na superfície oclusal. Os molares foram classificados quanto ao tipo, estágio de erupção, presença de biofilme e presença de lesão, bem como, sua condição de atividade. Os pacientes foram submetidos a um protocolo de tratamento não invasivo de 4 sessões com intervalos semanais baseado na educação para saúde bucal e fluorterapia. Após 3 semanas do término do tratamento, 39 pacientes foram re-examinados. Observou-se que os molares parcialmente erupcionados apresentaram maiores chances de permanecerem com lesão ativa após o protocolo de tratamento não invasivo quando comparados aos dentes totalmente em oclusão. Além disso, maior acúmulo de biofilme na superfície oclusal mostrou estar associado com maiores chances de uma lesão permanecer ativa após o tratamento quando comparada a ausência de biofilme visível. Para o segundo estudo, foram selecionados 39 pacientes, com pelo menos um molar permanente com lesão de cárie não cavitada em superfície oclusal, os quais foram classificados com relação à presença de lesões não cavitadas, bem como, sua condição de atividade segundo dois critérios: ICDAS-LAA e um critério padrão (características clínicas consenso na literatura). Os resultados mostraram fraca associação entre os dois critérios na determinação da atividade das lesões de cárie e baixa especificidade para o ICDAS-LAA. Com base nos resultados obtidos no primeiro estudo, pode-se concluir que: (1) o protocolo de tratamento não foi efetivo em inativar as lesões de cárie não cavitadas ativas de pacientes com molares parcialmente erupcionados e (2) foi encontrada uma forte associação entre molares permanentes parcialmente erupcionados, maior acúmulo de biofilme e a presença de lesões ativas mesmo após o tratamento instituído. A partir 7 dos resultados do segundo estudo, concluiu-se que o critério ICDAS-LAA não foi apropriado para a determinação da atividade de lesões de cárie não cavitadas em superfícies oclusais de molares permanentes, visto que parece superestimar a atividade das lesões.The aim of this study was to evaluate associated factors to non-cavitated caries lesions activity as well as different criteria for its assessment on occlusal surfaces of permanent molars. Therefore, two studies were carried out. The aims of the first study were: (1) to evaluate the effectiveness of a treatment for patients with non-cavitated caries lesions on permanent molars in different eruption stages and (2) to evaluate if the eruption stage and biofilm accumulation are associated to caries lesions activity in patients that received a non-operative treatment. The second study aimed at evaluating the association between two visual criteria in assessing non-cavitated caries lesions activity on permanent molars. For the first study, 48 patients aged from 5 to 13 years old were selected. Those patients should have presented at least one permanent molar with an active non-cavitated caries lesion on its occlusal surface. Molars were classified according to type, eruption stage, biofilm accumulation and presence of lesion as well as their activity status. All patients received a weekly non-operative treatment during 4 weeks based on oral health instructions and fluoride application. After 3 weeks, 39 patients were re-assessed. After the treatment, partially erupted molars were more prone to show active caries lesions than molars in full occlusion. Likewise, high biofilm accumulation was more associated to the presence of active caries lesions when compared to the absence of visible biofilm. For the second study, 39 patients with at least on permanent molar with non-cavitated caries lesion on occlusal surface were selected. Molars were classified according to the presence of caries lesions as well as to their activity status following two criteria: ICDAS-LAA and a standard criterion (based on clinical characteristics which are consensus in the literature). The results showed a weak association between both criteria in assessing caries lesions activity and low specificity for ICDAS-LAA. Based on the results from the first study, it can be concluded that: (1) treatment was not effective in arrest active non-cavitated caries lesion in patients with partially erupted molars and (2) a strong association between partially erupted molars, high biofilm accumulation and presence of active lesions was observed even after the treatment. From the results of the second study, it can be concluded that ICDAS-LAA criterion was not appropriate for activity assessment of non-cavitated caries lesions on occlusal surfaces of permanent molars, since this criterion seems to overestimate caries lesions activity.
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Gomes, Márcia. "Lesões de cárie adjacentes a restaurações de resina composta em molares decíduos e a sua relação com a atividade cariosa da criança." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/12132.
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Na dentição decídua, as restaurações adesivas apresentam uma longevidade média de 2 a 3 anos, contudo, muitas vezes, essas restaurações são substituídas antes deste período médio. Dentre os motivos mais prevalentes para substituição de restaurações, a lesão de cárie secundária é o mais freqüentemente citado. Esta dissertação teve como objetivo avaliar clinicamente, através de um estudo transversal, o comportamento de lesões cariosas adjacentes a restaurações de resina composta em molares decíduos, relacionando-o com a atividade de cárie da criança e com a integridade marginal da restauração. O estudo envolveu 64 pacientes infantis, de ambos os sexos, com idades variando entre 7 a 11 anos, que possuíam restauração oclusal (n = 33) ou ocluso-proximal (n = 31) de resina composta em molares decíduos. Nos pacientes com mais de uma restauração, a randomização dos dentes foi realizada para seleção de apenas uma restauração por criança, totalizando 64 restaurações avaliadas (média de idade em meses das restaurações = 29, 31 ± 16,85, mediana 31,5 meses). Como critério de inclusão, todos os indivíduos deveriam ter sido submetidos a tratamento odontológico para atividade cariosa. Os profissionais responsáveis por tal tratamento eram orientados para seguir um protocolo de atendimento clínico a crianças cárie-ativas. Um examinador treinado e calibrado (valor de Cohen’s kappa dicotômico = 1) avaliou a atividade de doença cárie (ativo ou inativo) do paciente e a presença radiográfica de imagens radiolúcidas relacionadas às margens oclusais das restaurações. Outros dois examinadores, também treinados e calibrados, avaliaram a restauração quanto ao comportamento da lesão cariosa adjacente à restauração (ausência de lesão, lesão ativa sem cavidade, lesão ativa com cavidade, lesão inativa sem cavidade, lesão inativa com cavidade; valor de Cohen’s kappa de múltiplos critérios = 0,844) e quanto à integridade marginal (presença ou ausência; valor de Cohen’s kappa dicotômico = 1). Todos os três examinadores realizaram as avaliações de forma independente e seguindo o princípio de cegamento. As variáveis explicativas foram relacionadas ao desfecho através dos testes estatísticos Qui-quadrado e Exato de Fisher (α=5%). Mais da metade das crianças apresentava-se como cárie–ativa durante a avaliação, sendo a prevalência de lesão cariosa adjacente à restauração (LCAdj) de 40,63% (maioria lesões inativas). Não houve associação entre a presença de LCAdj e a atividade cariosa da criança (p = 0,237). Houve associação estatisticamente significativa entre ausência de LCAdj e a presença de integridade marginal (p = 0,013). Com relação ao dente restaurado, foi constatada associação estatisticamente significativa entre a presença de LCAdj e o segundo molar decíduo (p = 0,033). Verificou-se também que a presença de LCAdj ocorreu preferencialmente nas restaurações mais antigas (p = 0,044). A partir dos resultados, pôde-se concluir que mesmo em pacientes inseridos em um programa de manutenção periódica profissional há uma grande ocorrência de lesões cariosas adjacentes a restaurações adesivas, predominando lesões inativas. A presença de integridade marginal da restauração mostrou estar relacionada à ausência desse tipo de lesão, contudo ausência de integridade marginal não foi completamente relacionada à LCAdj. Embora, não tenha sido possível observar correlação entre a atividade cariosa das crianças e a presença da LCAdj, futuros ensaios clínicos são necessários para observar o comportamento desse tipo de lesão.In the deciduous teeth the adhesive restorations last from 2 to 3 years although sometimes replacement takes place before the mean time. Among the most prevalent reasons for replacement of restorations, the secondary caries lesion is mentioned more often. The aim of this study was to evaluate clinically, through a transversal study, the behavior of adjacent caries lesion to composite resin restorations in deciduous molars, considering the relationship of the new lesion to the caries activity of the child and the marginal integrity of the restoration. Sixty four male and female pediatric patients mean age from 7 to 11years and with oclusal (n = 33) or occlusoproximal (n = 31) composite resin restoration in the deciduous molars were used. In the patients where more than one restoration fit the profile, a randomized selection was performed to assure that only one tooth was used per person, in the total 64 appraised restorations (mean of the age in month of the restorations = 29, 31 ± 16,85; median 31,5 months). As inclusion criteria, all patients must have been submitted to dental treatment for disease activity. The professional who performed such treatment was oriented to follow a clinical protocol for children with an active disease. A calibrated and trained examiner (Cohen’s kappa =1) evaluated the activity of the patient’s disease (active or non active), the presence of radiolucent images on dental occlusal surface of the restoration. Another 2 examiners, also trained and calibrated, evaluated the filling as for the behavior of the adjacent caries lesion to the restoration (absence of the lesion, non-cavitated active lesion, cavitated active lesion, non-cavitated inactive lesion, cavitated inactive lesion; Cohen’s kappa = 0,844) and marginal integrity (presence or absence; Cohen’s kappa =1). All the examiners performed the evaluation independently and following blindness principles. The variables were relation to outcome through by Chi-square and Fisher’ Exact analysis (α=5%). More than half of the patients were caries active during the evaluation period. The prevalence of adjacent caries lesion to the restoration (AdjCL) was 40.63% (most inactive lesions). There was no association among the presence of AdjCL and the caries activity of the child (p=0,237). The association of the absence of AdjCL and the presence of marginal integrity was statistically significant (p=0,013). Considering the restorated tooth, there was an association statistically significant among the presence of AdjCL and the second deciduous molar (p=0,033). Also, the presence of AdjCL occurred specially around older restorations (p=0,044). Analyzing the results, it was concluded that even patients submitted to standardized individual professional controlled treatment there is great occurrence of adjacent caries lesion to adhesive restorations, most inactive lesion. The presence of marginal integrity showed to be related to the absence of this lesion, but the absence of marginal integrity was not entirely related to AdjCL. Even though the correlation between caries activity and presence of AdjCL haven’t been observed, future clinical studies are necessary to observe the behavior of this type of lesion.
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Melo, Daniela Pita de. "Influencia de tempos alternativos de dessensibilização das placas de fosforo do sistema denoptix na qualidade da imagem digital." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289203.
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Orientador: Guilherme Monteiro TosoniDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo, neste trabalho, foi verificar se tempos alternativos de dessensibilização das placas de fósforo do sistema DenOptix causam interferência na qualidade da imagem radiográfica e no diagnóstico de cáries proximais. Foram obtidas imagens de 10 phantoms, constituídos de dentes humanos, utilizando-se placas de fósforo parcialmente dessenbilizadas. Os dez tempos de dessensibilização estudados foram em ordem decrescente: 130s, 98s, 66s, 34s, 25s, 20s, 15s, 10s, 5s e 0s. As imagens foram posteriormente avaliadas, quanto à sua qualidade subjetiva, por dois examinadores. Cada avaliador atribuiu escores para contraste, densidade e nitidez da imagem; para definição das estruturas - esmalte, dentina e junção amelo-dentinária; e para a presença ou ausência de imagem dupla. Os resultados foram submetidos à correlação de Spearman, análise de variância e teste de Tukey. Os tempos de 20s a 130s apresentaram qualidade satisfatória em todos os quesitos abordados. Após esta primeira avaliação, os seis tempos considerados estatisticamente eficazes nos quesitos referentes à qualidade geral da imagem foram submetidos a uma nova avaliação, quanto à presença de cárie proximal. As imagens correspondentes aos tempos selecionados foram interpretadas por cinco avaliadores. Cada avaliador atribuiu um escore para cada uma das faces dentárias interpretadas. Esses escores foram posteriormente comparados ao padrão ouro. Os tempos de dessensibilização alternativos foram avaliados, quanto à sua acurácia no diagnóstico de cárie, por meio da curva ROC. As médias das curvas ROC correspondentes aos tempos de dessensibilização avaliados variaram de 0,61 a 0,66 e não apresentaram diferença estatística significativa entre elas. O desempenho dos tempos de dessensibilização alternativos de 20s a 130s foi satisfatório tanto nos quesitos de qualidade geral da imagem como no diagnóstico de cáries proximais, demonstrando a possibilidade da utilização de tempos alternativos de dessensibilização das placas do sistema DenOptix na redução do tempo de trabalho na clínica diária
Abstract: The aim on this study was to verify if DenOptix¿s phosphor plates alternative erasing times would cause any influence on the image quality and on the diagnosis of approximal caries. Ten human teeth phantoms were radiographed using phosphor plates, partially erased. The chosen erasing times were: 130s, 98s, 66s, 34s, 25s, 20s, 15s, 10s, 5s e 0s. Two observers, independently, evaluated the general quality of each image, scoring the images on contrast, density, sharpness and structures definition (enamel, dentine and enamel-dentine junction). The presence of double image was also evaluated. The resultant data was evaluated using the Spearmen¿s correlation, variance analysis, and Tukey¿s test. The erasing times from 20s to 130s had a satisfactory quality in all the evaluated items. After the first evaluation, the erasing times that showed statistical efficiency in the evaluated quality items of the image went through another evaluation regarding the presence of approximal caries. The images of the selected erasing times were evaluated by five observers. Each observer scored the approximal surfaces of each tooth. The scores were compared to the golden standard. The alternative erasing times were evaluated by their accuracy on predicting caries by means of the ROC curve analysis. The means of the ROC curves of each erasing time evaluated varied from 0,61 to 0,66 and did not show significant statistical difference between them. The alternative erasing times from 20s to 130s was satisfactory both on the quality analysis as on approximal caries diagnosis, what makes the use of those alternative erasing times of DenOptix¿s phosphor plates feasible during clinical practice
Mestrado
Radiologia Odontologica
Mestre em Radiologia Odontológica
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Lee, Kwok-lun. "The oral epidemiology of 45-64 year-old Chinese residents of a housing estate in Hong Kong coronal and root caries /." Click to view the E-thesis via HKUTO, 1988. http://sunzi.lib.hku.hk/HKUTO/record/B38628260.
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Nakamura, Andrea Anzai. "Erupção de dentes decíduos e cárie precoce da infância: estudo longitudinal." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/25/25133/tde-12112009-144449/.
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A erupção de dentes decíduos e a cárie precoce da infância (CPI) foram estudadas longitudinalmente, avaliando-se os dados clínicos obtidos a cada quatro meses, de um grupo de 135 bebês, dos 7 aos 35 meses de idade, de baixa condição socioeconômica do Município de Bauru - SP. Não houve diferenças estatisticamente significantes entre os gêneros nas idades médias de erupção dos dentes decíduos, que irromperam na seguinte ordem: incisivos centrais inferiores, incisivos centrais superiores, incisivos laterais superiores e inferiores, primeiros molares superiores e inferiores, caninos superiores, caninos inferiores, segundos molares inferiores e segundos molares superiores. Sobre a CPI, a prevalência de cárie e o índice ceos aumentaram com a idade, alcançando 34,7% e 1,67, respectivamente, ao final do estudo; sem diferenças estatisticamente significantes, quanto ao gênero. A incidência de cárie foi maior aos 31 meses de idade dos bebês. Houve correlação positiva na prevalência de cárie entre dentes homólogos (p<0,05), e na incidência de cárie com a idade do bebê (p=0,001). Os incisivos centrais superiores foram os dentes mais afetados (p<0,05). Os segundos molares apresentaram a menor média de tempo necessário para a incidência de cárie (7,5 meses). Fatores como amamentação natural (OR=31,1), amamentação noturna, natural ou artificial (OR=9,10) e exposição ao flúor, através de dentifrício fluoretado (OR=0,0008) foram associados ao desenvolvimento da cárie. Fatores como presença de biofilme dentário visível (B=0,48) e amamentação noturna, natural ou artificial (B=0,21), foram associados com a reincidência de cárie. O conhecimento de aspectos clínicos da erupção relacionados à incidência da CPI é, portanto, essencial ao desenvolvimento de procedimentos preventivos e restauradores aplicados à Odontopediatria, sobretudo se for considerado que uma pequena parcela apresenta a maioria das lesões de cárie encontrada na população total.The eruption of deciduous teeth and early childhood caries (ECC) have been studied longitudinally, through clinical data obtained every four months, from a group of 135 infants, in the age range 7 - 35 months, coming from a low socioeconomic background, in Bauru, SP, Brazil. No statistically significant differences were seen between genders, in the mean ages of deciduous teeth eruption, which took place in the following order: lower central incisors, upper central incisors, upper and lower lateral incisors, upper and lower first molars, upper canines, lower canines, lower second molars and upper second molars. As for ECC, the caries prevalence and the dmfs index increased with age (34.7% and 1.67, respectively), with no statistically significant differences, as for the gender. Caries incidence was greater as the baby turned 31 months old. There was a positive correlation in caries prevalence between homologous teeth (p<0.05), and caries incidence with the baby´s age (p=0.001). The upper central incisors were the most affected teeth (p<0.05). The second molars presented the smallest mean of time necessary for caries incidence. Factors such as natural breast feeding (OR=31.1), natural or artificial nocturnal feeding (OR=9.10) and exposure to fluorine (OR=0.0008) were associated with caries development. Factors such as the presence of a visible dental biofilm (B=0.48) and natural or artificial feeding (B=0.21) were associated with the incidence of caries. The knowledge of the clinical aspects of eruption related to ECC is, therefore, essential to the development of preventive and restorative procedures applied to Paedriatic dentistry, mainly if taken into account that a small fraction of the population presents most caries lesions.
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Araújo, Giovana Spagnolo Albamonte de 1986. "Influência do tratamento clareador na alteração de cor de lesões em esmalte infiltradas e na degradação do infiltrante." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288600.
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Orientador: Regina Maria Puppin-RontaniTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Os objetivos desta tese composta por dois capítulos foram: Capítulo 1- Avaliar a estabilidade de cor e efetividade de tratamentos clareadores em lesões iniciais em esmalte infiltradas com Icon®. Capítulo 2- Avaliar a efetividade do clareamento com um gel experimental contendo natrosol substituindo o carbopol e avaliar a degradação causada no infiltrante por estes géis. Capítulo 1: Foram confeccionados espécimes à partir de dentes bovinos (N=30, 5x5x3mm) e divididos em três grupos (n=10): controle, desmineralizado e infiltrado. Lesões subsuperficiais artificiais foram desenvolvidas utilizando solução para produção de cárie, exceto no grupo controle (esmalte hígido). Nos espécimes do grupo infiltrado, após o desenvolvimento das lesões foi aplicado Icon®(DMG, Hamburgo, Alemanha). Medidas iniciais de cor foram realizadas utilizando espectrofotômetro (CM-700d, Konica Minolta), utilizando o sistema CIE L*a*b*. Os espécimes foram imersos em café, três vezes ao dia, durante 15 minutos, por 14 dias e em seguida armazenados em saliva artificial. Após a pigmentação, medidas de cor foram realizadas novamente. Os espécimes foram submetidos ao clareamento com gel de peróxido de carbamida 16%, por 4h diárias durante 21 dias, e medidas finais de cor foram realizadas. Para comparar medidas iniciais e finais, foi aplicado o teste-t (?=0,05). A comparação entre os grupos foi realizada por ANOVA 1 fator e teste de Tukey (?=0,05). A pigmentação com café promoveu redução significativa nos valores de L* e aumento nos valores de a* e b* em todos os grupos (controle, clareado e infiltrado). O clareamento promoveu aumento nos valores de L* e redução nos valores de a* and b* em todos os grupos. Não houve diferença nos valores de ?E entre os grupos cariados e infiltrados antes do clareamento. Após o clareamento, o grupo infiltrado apresentou os menores valores de ?E, similares ao controle. Pode-se concluir que o esmalte infiltrado com Icon® apresentou alteração de cor após a pigmentação, similares ao esmalte cariado. Entretanto, se ocorrer pigmentação em dentes infiltrados, o tratamento com géis clareadores pode ser realizado com sucesso. Capítulo 2: Foram confeccionados 50 espécimes de infiltrante (Icon®, DMG, Hamburgo, Alemanha), divididos em 5 grupos (n=10), de acordo com o gel a ser exposto: controle (G1), peróxido de carbamida 16% com natrosol (G2), peróxido de carbamida 16% com carbopol(G3), natrosol(G4), carbopol(G5). Os tratamentos foram realizados durante 21 dias, 4 horas ao dia. Medidas de dureza Knoop (HMV-2, Shimadzu), rugosidade (Surfcorder SE1700, Kosaka), análise de cor utilizando espectrofotômetro (CM-700d, Konica Minolta) e imagens de microscopia por força atômica (EasyScan 2, Nanosurf) foram realizadas. Além disso, 50 blocos obtidos à partir de dentes bovinos foram submetidos à pigmentação com chá preto e clareamento utilizando os géis citados acima. Os resultados foram submetidos a ANOVA 1-fator para comparação entre os grupos e teste-t para comparação inicial e final de cada grupo (?=0,05). Pode ser observada redução de dureza nas amostras de Icon® após aplicação do peróxido de carbamida, independente do espessante (G2 inicial: 13,21/final:10,99 e G3 inicial:12,00/final:11,33). Comparando-se todos os grupos após o tratamento, o G4 apresentou maior valor de dureza (13,92), seguido pelo G1(12,77) e G5(12,27). Houve aumento de rugosidade após o tratamento em todos os grupos, porém não houve diferença estatística entre os grupos. Através das imagens de microscopia por força atômica pode-se observar maior irregularidades na superfície do G5. Em relação à efetividade do clareamento, os grupos G2 e G3 promoveram aumento nos valores de L* e maiores valores de ?E. Os grupos G4 e G5 apresentaram valores de L* semelhantes. Pode-se concluir que o peróxido de carbamida associado com natrosol ou carbopol é eficaz no clareamento de dentes infiltrados com Icon®, porém causam degradação superficial no infiltrante
Abstract: The objectives of this thesis, accomplished on two chapters, were: Chapter 1- To evaluate color stability of white spot lesions with Icon® after staining and the bleaching effect in the infiltrated and stained surfaces. Chapter 2- to evaluate surface degradation of Icon® after application of bleaching gels containing natrosol as a thickener and their bleaching effectiveness. Chapter 1- Enamel-dentine specimens (N=30, 5x5x3mm, 1 mm enamel + 2 mm dentine thickness) were prepared from bovine incisors and randomly allocated into three groups (n=10): control, demineralized, infiltrated. Artificial enamel subsurface lesions were created using 50 mL of 0.05 M acetate buffer solution. Specimens were produced by the Icon®(DMG, Hamburgo, Alemanha) application in the enamel caries like-lesions. Baseline color reading were assessed using a spectrophotometer (CM-700d, Konica Minolta), and CIE L*a*b* measurements of each specimen were performed using a white background. In order to simulate extrinsic dietary staining, specimens were placed into 4 mL coffee infusion, three-times daily for 15 minutes, for 14 days. After the staining procedure, color measurements were performed again. Then, bleaching procedures were performed using 16% carbamide peroxide gel, for 4h daily, for 21 days and final measure assessment was performed. To compare baseline and final measurements, t-test was used (p<0.05). The statistical comparison between groups was performed using one-way ANOVA and Tukey tests (p<0.05). Coffee staining provided a significant reduction of L* values and increase of a* and b* in all groups (control, decayed and infiltrated). Bleaching procedure provided a significant increase on L* and decrease of a* and b* values in all groups. There was no significant difference on ?E values between decayed and Infiltrated groups before bleaching, and after bleaching, infiltrated group showed the lowest ?E values. It can be concluded that enamel infiltrated with Icon present significant color alteration after staining, when compared to sound enamel. However, if the infiltrant discoloration occurs, bleaching treatment can be used successfully. Chapter 2 - 50 specimens of infiltrant (Icon®, DMG, Hamburgo, Alemanha) were produced and allocated into 5 groups (n = 10) in accordance with the gel were made to be exposed: Control (G1), carbamide peroxide 16% with natrosol (G2), carbamide peroxide with carbopol (G3), natrosol (G4), carbopol (G5). Bleaching treatments were performed for 21 days, 4 hours per day. Hardness Knoop measurements (HMV-2, Shimadzu), roughness measurements (Surfcorder SE1700, Kosaka), and atomic force microscopy images (EasyScan 2, Nanosurf) were performed after bleaching treatments. In addition, the 50 blocks obtained from bovine teeth were submitted to bleaching treatment with gels mentioned above. The results were subjected to ANOVA one-way for comparison between groups and t-test for comparing initial and final of each group (?<0.05). Knoop Hardness decreased can be observed after application of carbamide peroxide, regardless of thickener (initial G2: 13.21 / final: 10.99 and G3 initial: 12.00 / final: 11,33). Comparing all groups after treatment, G4 showed higher hardness Knoop value (13.92), followed by G1 (12.77) and G5 (12.27). After bleaching, there was roughness increase for all groups, and there was no statistical difference between them. Atomic force microscopy images show higher surface irregularity in G5. Regarding bleaching effectiveness, G2 and G3 groups presented increase in L * values and highest ?E values. G4 and G5 groups showed statistically similar L* values. It can be concluded that carbamide peroxide with natrosol and carbamide peroxide with carbopol may cause surface degradation. Carbamide peroxide associated with natrosol or carbopol is effective in whitening teeth infiltrated with Icon®. Further studies should be performed to evaluate the leaching of components infiltrating subjected to degradation over time
Doutorado
Materiais Dentarios
Doutora em Materiais Dentários
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Sousa, Janaína Maniezo de. "Avaliação da maturação pós-eruptiva do esmalte de dentes humanos hígidos e sua resposta frente a um desafio cariogênico in vitro por meio da microdureza longitudinal." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/25/25145/tde-01062011-095409/.
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Sabe-se que dentes recém-irrompidos são mais susceptíveis a lesões cariosas comparados aos dentes mais velhos. O risco elevado à desmineralização tem sido também comprovado por experimentos in vitro. No entanto, a maioria dos trabalhos é realizada com amostras polidas provenientes de diferentes tipos de dentes. Adicionalmente, não há dados comparativos entre a mesma amostra hígida e desmineralizada. Portanto, este estudo teve como objetivo avaliar o impacto da maturação pós-eruptiva do esmalte humano hígido sobre a desmineralização in vitro por meio da microdureza longitudinal. Cada grupo de dentes foi composto por 12 espécimes de esmalte de terceiros molares: não irrompidos, com 1 a 6 meses de erupção e com 2 a 3 anos de erupção. As amostras foram protegidas em 2/3 da superfície e submetidas à formação de lesão cariosa artificial (gel de metilcelulose com ácido lático, pH 4,6, 14 dias). A microdureza longitudinal foi realizada na superfície hígida e desmineralizada nas distâncias de 10 a 220µm. Os dados foram analisados por ANOVA/Tukey ou Kruskall-Wallis/Dunn (p<0,05). As médias de dureza da superfície hígida (KHN), o KHN (superfície cariada) e a profundidade da lesão (m) para os grupos submetidos ao desafio cariogênico foram, respectivamente: incluso (333,2/13.567/81,67), 1-6m (355,9/13.332/78,33) e 2-3a (382,9/14.019/73,33). Concluiu-se que dentes com diferentes idades pós-eruptivas apresentam diferenças em relação à microdureza longitudinal do esmalte hígido que podem não refletir em maior susceptibilidade à desmineralização quando um gel acidificado é utilizado para provocar lesão de cárie artificial.It is known that newly erupted teeth are more susceptible to carious lesions compared to older teeth. The high risk of demineralization has also been proven by in vitro experiments. However, most work is performed with polished samples from different types of teeth. Additionally, there is no comparative data between sound and demineralized enamel from the same tooth. Therefore, this in vitro study evaluated enamel maturation at different depths in sound and demineralized human teeth at different posteruptive ages by cross-sectional hardness (CSH). Each group was composed by 12 enamel samples from 3rd molars: unerupted, with 1-6 months and 2-3 years. The samples had two thirds of the surface protected and were subjected to demineralization (methylcellulose gel/lactic acid, pH 4.6, 14 days). Cross-sectional hardness was performed on sound and demineralized enamel on distances from 10 to 220µm. Data were analyzed by ANOVA/Tukey or Kruskall-Wallis/Dunn (p<0.05). Means of sound enamel hardness (KHN), KHN (demineralized surface) and lesion depth (m) for the groups submitted to acid gel were: unerupted (333.2/13,567/81.67), 1-6 m (355.9/13,332/78.33) and 2-3y (382.9/14,019/73.33). It was concluded that teeth with different post-eruptive ages differ regarding to the cross-sectional hardness of sound enamel, which in turn may not reflect a higher susceptibility to demineralization when an acidified gel is used to provoke artificial carious lesion.
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Neves, Beatriz GonÃalves. "Molecular detection of bacteria in dentinal carious lesions and in biofilm of children with different stages of early childhood caries." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14164.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoEarly childhood caries (ECC) is considered a serious public health issue among children all over the world. However, many aspects should be explored about the oral microbiota related to the ECC progression and how the bacterial community modifies according to the dentine lesion activity. This thesis, composed by two chapters, aimed to investigate and quantify with quantitative polymerase chain reaction (qPCR) the following bacteria Actinomyces naeslundii, Bifidobacterium spp., Lactobacillus acidophilus, Streptococcus gordonii, Streptococcus mutans, as well as members of the groups Lactobacillus casei and Mitis on biofilm from pre-school children with different stages of early childhood caries progression (Chapter 1) and on active and inactive dentine carious lesions (Chapter 2), and also to verify the association of these microorganisms on the process of health or disease. The sample consisted on preschool children aged between 2 and 5 years from nurseries and public preeschools in Fortaleza-CE. The children were examined for caries diagnosis with ICDAS II index (International Caries Detection Assessment System), and the Nyvad criteria, in order to evaluate prevalence and caries activity. The supragingival biofilm collection was taken from 75 children, who were divided in three groups according to the ICDAS II: CF (caries free) (n=20), ECL (presence of enamel caries lesion) (n=17) and DCL (presence of dentine caries lesion) (n=38). Samples of carious dentine were collected under rubber dam isolation of 56 lesions of dentine affected by caries, being 17 inactive and 39 active. The DNA of all the collected samples was extracted and purified, then tested for the presence of the formerly mentioned bacterial species/groups through qPCR. The quantity of bacteria was compared through the Kruskal-Wallis and Mann-Whitney tests. Besides, the association between the presence of bacteria and ECC was analyzed through the Chi-square test, with a 5% significance level and the multiple logistic regression was applied. Bacteria from the group L. casei and L. acidophilus presented low detection on biofilm of all evaluated groups. The presence of S. mutans and Bifidobacterium spp. showed a strong association with dental caries progression on the biofilm from children with dentine lesions with odds ratio of 21,5 and 5,9; respectively. On active dentine lesions, concentrations of Bifidobacterium spp. and species from the Lactobacillus casei group were significantly higher when compared to the inactive lesions (p<0.05). The levels of Actinomyces naeslundii, Streptococcus gordonni and species from Mitis group were not significantly different among biofilm groups as well as comparing dentine lesions. In conclusion, the microbial profile from biofilm samples presented differences on the proportion of acidogenic and aciduric bacteria with dental caries progression. The presence of Bifidobacterium spp. and S. mutans presented a strong association with the development of the more advanced stages of ECC. Regarding the activity of dentine lesions, higher detection levels of the group L. casei and Bifidobacterium spp. showed an important role of these bacteria in the dentine caries activity.
A cÃrie precoce da infÃncia (CPI) Ã considerada um grave problema de saÃde pÃblica em crianÃas prÃ-escolares em todo mundo. No entanto, muitos aspectos ainda devem ser explorados acerca da microbiota oral relacionada com a progressÃo da CPI e como a comunidade bacteriana se modifica de acordo com a atividade da lesÃo dentinÃria. Esta tese, constituÃda de dois capÃtulos, teve como objetivo identificar e quantificar atravÃs da tÃcnica de reaÃÃo em cadeia da polimerase quantitativa (qPCR) as bactÃrias Actinomyces naeslundii, Bifidobacterium spp., Lactobacillus acidophilus, Streptococcus gordonii, Streptococcus mutans, bem como espÃcies dos grupos Lactobacillus casei e Mitis em biofilme de crianÃas prÃ-escolares com diferentes estÃgios de progressÃo da cÃrie precoce da infÃncia (CapÃtulo 1) e em lesÃes cariosas dentinÃrias ativas e inativas (CapÃtulo 2) e ainda verificar a associaÃÃo destes microrganismos ao processo de saÃde ou de doenÃa. A amostra consistiu em prÃ-escolares com idade entre 2 e 5 anos de idade que frequentavam creches e escolas pÃblicas de Fortaleza-CE. As crianÃas foram examinadas com o uso de Ãndices visuais ICDAS II (International Caries Detection Assessment System) e Nyvad, a fim de avaliar a prevalÃncia e atividade de cÃrie. A coleta de biofilme supragengival foi realizada em 75 crianÃas, as quais foram agrupadas de acordo com Ãndice ICDAS II em trÃs grupos: CF (livres de cÃrie) (n=20), ECL (presenÃa de lesÃes de cÃrie em esmalte) (n=17) e DCL (presenÃa de lesÃes de cÃrie em dentina) (n=38). Amostras de dentina cariada foram coletadas sob isolamento absoluto de 56 lesÃes cariosas dentinÃrias, sendo 17 inativas e 39 ativas. O DNA de todas as amostras coletadas foi extraÃdo e purificado e, em seguida, testado para a presenÃa das espÃcies/grupos bacterianos acima citados atravÃs de qPCR. A quantidade das bactÃrias foi comparada pelos testes Kruskal-Wallis e Mann-Whitney. AlÃm disso, a associaÃÃo da presenÃa de bactÃrias e CPI foi analisada atravÃs do teste Qui-quadrado, com nÃvel de significÃncia de 5% e aplicado a regressÃo logÃstica mÃltipla. BactÃrias L. acidophilus e do grupo L. casei apresentaram baixa detecÃÃo no biofilme de todos os grupos avaliados. A presenÃa de S. mutans e Bifidobacterium spp. mostrou forte associaÃÃo com a progressÃo da doenÃa no biofilme de crianÃas com lesÃes dentinÃrias com âodds ratioâ de 21,5 e 5,9, respectivamente. Em lesÃes dentinÃrias ativas, concentraÃÃes de Bifidobacterium spp. e bactÃrias do grupo L. casei foram significativamente maiores quando comparadas Ãs lesÃes inativas (p<0.05). Os nÃveis de A. naeslundii, bactÃrias do grupo Mitis e S. gordonni nÃo apresentaram diferenÃa significativa entre os grupos de biofilme, assim como nas lesÃes dentinÃrias. Conclui-se que as amostras de biofilme apresentaram alteraÃÃo na proporÃÃo de bactÃrias acidogÃnicas e acidÃricas com a progressÃo da doenÃa cÃrie. A presenÃa de Bifidobacterium spp. e S. mutans apresentou forte associaÃÃo com os estÃgios mais avanÃados da CPI. Em relaÃÃo Ãs lesÃes dentinÃrias, o aumento da concentraÃÃo de bactÃrias Bifidobacterium spp. e do grupo L. casei evidenciou um papel importante destas bactÃrias na atividade de lesÃes dentinÃrias.
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Velo, Marilia Mattar de Amoêdo Campos 1984. "Validation of a pH-cycling model to evaluate the effect of fluoridated toothpastes on enamel demineralization of human primary teeth = Validação de modelo de ciclagens de pH para avaliar o efeito de dentifrícios fluoretados na desmineralização do esmalte de dente decíduo humano." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290563.
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Orientador: Cínthia Pereira Machado TabchouryDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O efeito de dentifrícios fluoretados na prevenção da cárie dentária na dentição decídua é concentração-dependente. No entanto, não há um modelo de ciclagens de pH validado em termos de dose-resposta ao fluoreto (F) para esmalte de dente decíduo humano. Assim, esse estudo validou um modelo de ciclagens de pH em termos de dose-resposta ao F para avaliar a desmineralização do esmalte de dente decíduo, e posteriormente, o modelo foi testado com dentifrícios comerciais com diferentes concentrações de F. Dois estudos independentes foram realizados e blocos de esmalte de dente decíduo (3 X 3 X 2 mm), selecionados pela dureza de superfície, foram usados em ambos. Para validar o modelo, blocos dentais (n=12/grupo) foram submetidos ao modelo de ciclagens de pH e tratados duas vezes ao dia com: água purificada (controle negativo) e soluções contendo 62,5; 125, 250 e 375 ?g F/mL. Essas concentrações de F foram escolhidas para simular a diluição (1:3 g/g) que ocorre na cavidade oral quando dentifrícios contendo 250, 500, 1000 e 1500 ?g F/g, respectivamente, são usados. O modelo durou 10 dias e os blocos permaneceram diariamente por 6 h em solução desmineralizante e 18 h em solução remineralizante a 37°C. Após a validação, o modelo foi testado com dentifrícios comerciais e blocos de esmalte (n=15/grupo) foram tratados com: dentifrício não fluoretado, 500 ?g F/g, como dentifrício de baixa concentração de F, 1100 e 1450 ?g F/g, como dentifrícios convencionais. A porcentagem de perda de superfície (%PDS) e área da lesão de cárie (?S) foi determinada. O efeito dose-resposta ao F foi analisado por regressão quadrática e o efeito do teste com dentifrícios pelo teste de Tukey. O modelo mostrou relação dose-resposta entre concentração de F e %PDS (R²=0,7047; p<0,01) e ?S (R²=0,4465; p<0,01). Quando o modelo de ciclagens de pH foi usado para avaliar o potencial anticárie de dentifrícios fluoretados comerciais, a média (±DP) de %PDS e ?S para o grupo tratado com 500 ?g F/g foi 36,6±8,0 e 6298,5±1221,3, respectivamente, os quais foram significativamente maiores que os grupos tratados com dentifrícios de 1100 (25,2±8,7 e 4565,7±1122) e 1450 ?g F/g (24,2±5,2 e 2339,1±879,7), respectivamente. Em conclusão, o modelo proposto validado é capaz de diferenciar o potencial anticárie de dentifrícios de baixa concentração de F (500 ?g F/g) dos dentifrícios de concentração convencional (1000-1500 ?g F/g)
Abstract: The effect of fluoridated toothpaste on dental caries prevention in primary dentition is concentration-dependent. However, there is no pH-cycling model validated to assess the dose-response to fluoride (F) in human primary teeth enamel. Thus, this study validated a pH-cycling model in terms of dose-response to F to evaluate primary teeth enamel demineralization, and later, the model was tested with commercial toothpastes with different F concentrations. Two independent studies were conducted and primary teeth enamel slabs (3 X 3 X 2 mm), selected according to the surface hardness, were used in both. To validate the model, dental slabs (n=12/group) were submitted to the pH-cycling model and treated twice a day with: purified water (negative control) and solutions containing 62.5; 125; 250 and 375 ?g F/mL. These F concentrations were chosen to simulate the dilution (1:3 w/w) that occurs in the oral cavity when dentifrices containing 250, 500, 1000 and 1500 ?g F/g, respectively, are used. The model lasted 10 days and the slabs remained daily for 6 h in a demineralizing solution and 18 h in a remineralizing solution at 37°C. After validation, the model was tested with commercial toothpastes and enamel slabs (n=15/group) were treated with: no F toothpaste, 500 ?g F/g, as low F toothpaste, 1100 and 1450 ?g F/g, as standard toothpastes. The percentage of surface microhardness loss (%SMHL) and the carious lesion area (?S) were determined. The dose-response effect to F was analyzed by quadratic regression and the toothpaste effect by Tukey¿s test. The model showed dose-response relationship between F concentration and %SMHL (R²=0.7047; p<0.01) and ?S (R²=0.4465; p<0.01). When the pH-cycling model was used to evaluate the anticaries potential of commercial toothpastes, the mean (±SD) of %SMHL and ?S for the group treated with 500 ?g F/g was 36.6±8.0 and 6298.5±1221.3, respectively, which were significantly higher than those treated with 1100 (25.2±8.7 and 4565.7±1122) and 1450 ?g F/g toothpastes (24.2±5.2 and 2339.1±879.7), respectively. In conclusion, this validated model is able to differentiate the anticaries potential of toothpaste with low F concentration (500 ?g F/g) from those with standard concentrations (1000-1500 ?g F/g)
Mestrado
Cariologia
Mestra em Odontologia
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Pontual, Andrea dos Anjos. "Estudo comparativo de tres sistemas digitais sem cabo no diagnostico de caries proximais." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288986.
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Orientador: Francisco Haiter NetoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo, nesse trabalho, foi comparar, de forma objetiva e subjetiva, dois sistemas digitais de placa de armazenamento de fósforo (Digora Optime® e DenOptix®), com o sistema CDR Wireless®, utilizando o filme radiográfico como método radiográfico de referência. Para a análise objetiva, foram obtidas imagens radiográficas de uma escala de densidade de Alumínio utilizando os três sistemas digitais. Posteriormente, obtiveram-se os valores do pixel por meio de ferramenta apropriada do software EMAGO®/Advanced. A comparação dos valores médios do pixel dos sistemas digitais foi realizada pelos testes de Kruskal-Wallis e de comparações múltiplas de Dunn (p<0,01). Para a avaliação subjetiva, foram obtidas imagens radiográficas de 20 phantoms constituídos de dentes posteriores, as quais foram avaliadas quanto à presença de cáries por seis radiologistas. Posteriormente, os dentes foram seccionados e analisados microscopicamente para obtenção do padrão ouro. Foram realizados a análise de variância e o teste-t (p<0,05) com o objetivo de verificar a ocorrência de diferença estatisticamente significativa entre os valores de sensibilidade, especificidade, acurácia (área sob a curva ROC), valores preditivos negativos e positivos das modalidades de imagem. Os resultados mostraram diferenças significativas nos valores médios do pixel para os três sistemas digitais, sendo que o Digora Optime® (194,46) apresentou o maior valor, seguido pelo DenOptix® (168,34) e pelo CDR Wireless® (109,44). Os sistemas CDR Wireless® e Digora Optime® obtiveram maiores valores de sensibilidade em relação às demais modalidades de imagem, sendo estatisticamente significativa a diferença entre esses sistemas e o filme radiográfico convencional (p=0,032). O Digora Optime® revelou o menor valor de especificidade e acurácia, o qual foi significativamente inferior ao do filme convencional (p<0,013). O sistema digital CDR Wireless® demonstrou desempenho semelhante ao filme radiográfico Insight® na detecção de cáries proximais incipientes. Por conseguinte, no tocante à qualidade da imagem, o novo CDR Wireless® pode ser uma alternativa viável para a utilização na clínica como método auxiliar de diagnóstico
Abstract: The aim of this study was to compare, both objectively and subjectively, the radiographic image quality of two storage phosphor plate systems (Digora Optime® e DenOptix®) with the results of the new complementary metal oxide silicon system, the CDR Wireless®. For the objective analysis, radiographs of an aluminum step wedge were obtained using the tree digital systems. This analysis was carried out by pixel density measurements using the appropriate tool from the EMAGO®/Advanced software. The data of pixel measurements was analyzed statistically using Kruskal-Walils test and Dunn multiple comparisons test (p<0.01). For the subjective analysis, under in vitro and standardized conditions, twenty phantoms with posterior human teeth were radiographed using one conventional film (Insight® Kodak) and the tree digital systems. Six radiologists recorded small approximal caries lesions on a 5-point confidence scale. The presence of caries was validated histologically. Two-way analysis of variance and post hoc t-test tested differences in sensitivity, specificity, accuracy, and positive predictive and negative predictive values. Differences were considered statistically significant when p<0.05. The results showed significant differences in the pixel density values for the three digital systems, with the Digora Optime® presenting the greatest values (194.46), followed by the DenOptix® (168.34) and CDR Wireless® (109.44). The two-way analysis of variance and post hoc t-tests demonstrated that CDR Wireless® and Digora Optime® had higher sensitivity than almost all other image modalities, significantly higher than conventional film. Digora Optime® had the lowest specificity and accuracy of all systems. Statistically significant difference existed in specificity and accuracy between this system and the conventional film (p<0.05), among the others systems there were no significant differences (p>0.05). The results suggest that the performance of the new CDR Wireless® was comparable to those of the digital systems and that of the Insight® film. Therefore, regarding to image quality, the new CDR Wireless® system may be used as an alternative, in clinical activities, as a diagnostic complementary method
Doutorado
Radiologia Odontologica
Mestre em Radiologia Odontológica
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Mattos-Silveira, Juliana. "Diamino fluoreto de prata - uma nova proposta para o tratamento não operatório de lesões proximais em molares decíduos: estudo clínico randomizado." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/23/23132/tde-08082016-104859/.
Full textAbstract:
Este ensaio clínico randomizado, cego e controlado com placebo teve como objetivo principal avaliar a eficácia do diamino fluoreto de prata (DFP) a 30% no tratamento não operatório de lesões de cárie em superfícies proximais de molares decíduos e compará-la a eficácia do infiltrante resinoso e a do controle do biofilme interproximal pelo uso do fio dental. Além disso, também avaliou a custo-eficácia e o desconforto dos tratamentos e a satisfação dos participantes quanto ao tratamento recebido. Para isso, foram selecionadas 141 crianças entre 3 e 10 anos de idade, que apresentavam pelo menos uma superfície proximal com lesão de cárie clinicamente em esmalte. A alocação dos participantes foi aleatória, de acordo com o tratamento: DFP a 30%, infiltrante resinoso de cárie e orientação para o uso diário do fio dental (controle). Todos os participantes receberam o tratamento ativo para os quais foram alocados e também o placebo dos tratamentos realizados nos outros grupos. Os custos dos materiais utilizados nos tratamentos foram registrados. Ao final da consulta de tratamento, foi aplicada aos participantes a Escala Facial de Wong-Baker para avaliação do desconforto. Os responsáveis pelos participantes, que concluíram o seguimento da pesquisa, responderam a um questionário de satisfação sobre o tratamento recebido. As crianças foram examinadas após 1 mês para avaliação de higiene bucal e também de presença de biofilme nas superfícies tratadas. Após 6, 12 e 24 meses, foram realizados exames visual e tátil para verificar a progressão das lesões tratadas, além de exame radiográfico aos 12 e 24 meses. Para avaliar a eficácia dos tratamentos, consideraram-se como desfechos: (I) qualquer progressão clínica da lesão tratada e (II) progressão para cavidade em dentina. A progressão radiográfica foi utilizada como um desfecho secundário e para comparar com o padrão clínico de progressão das lesões. Análises de regressão foram realizadas para verificar se os grupos de tratamento influenciaram os desfechos testados após 12 e 24 meses de seguimento (análise por protocolo - Poisson multinível e análise de sobrevida). Valores pontuais de custo-eficácia dos tratamentos foram calculados e, para comparar a custo-eficácia da implementação do uso do DFP em relação às outras opções testadas foi utilizada a razão de custo-eficácia incremental. Análises de regressão de Poisson foram utilizadas para verificar a associação entre o desconforto e variáveis explicativas. A satisfação dos participantes e seus responsáveis foi explorada descritivamente. Um total de 316 superfícies proximais foram incluídas, sendo a maioria classificada como escore 2 do ICDAS (Sistema Internacional de Detecção e Avaliação de Cárie) associadas à ausência de imagem radiográfica (46,8%). As perdas de seguimento foram de 15% e 24% aos 12 e 24 meses, respectivamente. Não houve associação entre o grupo de tratamento e a progressão das lesões aos 12 e 24 meses, tanta pela análise por protocolo como pela análise de sobrevida. A taxa de progressão clínica das lesões para cavidade em dentina foi de 2,5% aos 12 meses e de 5,6% aos 24 meses. As lesões que não apresentavam imagem radiográfica inicial não progrediram para o 1/3 médio de dentina ou mais. A condição clínica inicial das lesões foi associada à progressão das lesões em todas as análises. Já o risco de cárie foi associado à progressão das lesões aos 24 meses e também na análise de sobrevida. O tratamento com infiltrante resinoso apresentou o custo mais elevado, fazendo com que o tratamento com DFP apresentasse melhor relação custo-eficácia do que este primeiro. Os participantes tratados com o DFP e os que receberam orientação para o uso do fio dental relataram menor desconforto do que os tratados com o infiltrante resinoso. Os responsáveis se mostraram satisfeitos com o tratamento recebido, independentemente do grupo ao qual foram alocados. Conclui-se que o tratamento com DFP é tão eficaz quanto o infiltrante resinoso e a orientação para o uso do fio dental no controle das lesões iniciais em proximal de molares decíduos. No entanto, causa menor desconforto e apresenta custo-eficácia superior ao infiltrante resinoso, devendo ser preferível para superfícies proximais de molares decíduos, em situações nas quais o tratamento dessas lesões possa ser necessário, como por exemplo, pacientes com experiência de cárie.This randomized, blinded and placebo-controlled clinical trial aimed to evaluate the efficacy of 30% silver diamine fluoride (SDF) as a non-operative treatment of the approximal surfaces of primary molars and to compare it with the efficacy of resin infiltration and the mechanical control of the interproximal biofilm by flossing. We also evaluated the cost-efficacy and the discomfort of the treatments as well as the parent\'s satisfaction regarding treatments. One hundred forty-one, 3-to-10-year-old, children were included. They must present at least one caries lesion clinically into enamel sited on an approximal surface of primary molar. Participants were randomly allocated to the following groups according to active treatment to be received: 30% SDF, caries resin infiltration, flossing orientation (control). All participants received the active treatment, in which they were allocated and they also received the placebo treatment corresponding to the other groups. Costs of materials used in the treatment were registered. In the end of treatment session, the Wong-Baker faces scale was applied to evaluate participants\' reported discomfort. Children were examined after 1 month to evaluation of the oral hygiene and the presence of the biofilm on the treated surfaces. After 6, 12 and 24 months, visual and tactile examinations were performed to verify the lesions progression. Radiography was taken at 12- and 24-month follow-ups. To evaluate the efficacy of non-operative treatments, two outcomes were considered: (I) any clinical progression and (II) progression to cavity into dentine. The radiographic progression was used as a secondary outcome and to evaluate with clinical standard of lesions progression. Regression analyses were used to verify if the treatment influenced on these outcomes after 12 and 24 months (per-protocol analyses - multilevel Poisson and survival analysis). Cost-efficacy ratios were calculated for the treatments. To compare the cost-efficacy of implementing the use of DFP versus other options tested, the incremental cost-efficacy ratio was used. Poisson regression analyses were used to verify the association between discomfort and explanatory variables. The parents\' satisfaction about the treatments were explored descriptively. A total of 316 approximal surfaces were included. The majority of them were classified as ICDAS (International Caries Detection and Assessment System) score 2 associated with absence of radiographic image. The dropout in the study was 15% and 24% at 12-month and 24-month follow-up, respectively. There was no association between treatment groups and lesions progression at 12 and 24 months, both for the per-protocol analysis and by survival analysis. The rate of clinical lesions progression to cavity into dentine was 2.5% at 12 months and 5.6% at 24 months. Lesions without initial radiographic image did not progress into the middle of the dentine or more. Baseline clinical condition of caries lesions was associated with lesions progression in all analyses. The caries risk was also associated to caries progression in 24-month analyses and in the survival analyses. The treatment with resin infiltration was costlier. Consequently, the treatment with SDF was more cost-effective than resin infiltration. The participants allocated to SDF and control groups reported less discomfort than those who was allocated to the resin infitrant group. The parents were satisfied with the treatment received during the study, independently of the group to which their children had been allocated. It is possible to conclude that the SDF is as efficacious as the resin infiltration and flossing orientation to control initial lesions in the approximal surfaces of primary molars. However, SDF causes less discomfort and presents superior cost-efficacy relationship than resin infiltration and could be preferable to treat approximal caries in primary molars in those situations in which the treatment could be necessary, for example, depending on patients\' caries experience.
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Silva, Cristiane Maria da Costa 1977. "Study of demarcated enamel opacities in deciduous and permanent molars = Estudo de opacidades demarcadas de esmalte em molares decíduos e permanentes." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290873.
Full textAbstract:
Orientador: Fábio Luiz MialheTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O resumo poderá ser visualizado no texto completo da tese digital
Abstract: The abstract is available with the full electronic document
Doutorado
Saude Coletiva
Doutora em Odontologia
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Mello, Bianca Zeponi Fernandes de. "Avaliação da resposta do complexo dentino-pulpar de dentes decíduos após procedimentos clínicos conservadores." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/25/25145/tde-03092015-085930/.
Full textAbstract:
O objetivo do presente estudo foi avaliar por meio de observações clínicas e radiográficas a resposta in vivo do complexo dentino-pulpar de dentes decíduos humanos após a realização da remoção parcial e total do tecido cariado. Quarenta e nove molares decíduos de crianças com idades entre 5 a 9 anos foram criteriosamente selecionados. Os dentes foram divididos em dois grupos: Grupo I remoção parcial do tecido cariado; Grupo II remoção total do tecido cariado. As avaliações clínicas e radiográficas foram realizadas nos períodos de 4 a 6 meses do pós-operatório. A reprodutibilidade intra-examinador foi determinada pelo teste Kappa. O teste exato de Fisher foi utilizado para determinar a diferença estatística entre os grupos. Todos os dentes apresentaram sucesso clínico no período de avaliação de 4 a 6 meses. A avaliação radiográfica mostrou 94,2% e 89,6% de sucesso no Grupo I e no Grupo II, respectivamente. Os resultados radiográficos não mostraram diferença estatisticamente significativa nos grupos estudados em nenhum dos critérios avaliados (p>0,05). Com base nos resultados obtidos para amostra estudada, e de acordo com a metodologia aplicada, a remoção parcial do tecido cariado exibiu resultados clínicos e radiográficos satisfatórios, sugerindo que a abordagem minimamente invasiva para remoção de cárie dentária pode substituir a remoção total do tecido cariado quando indicada corretamente.The aim of this study was to evaluate through clinical and radiographic observation the in vivo response of the dentin pulp complex of human deciduous teeth after the partial and total removal of the caries. Forty-nine deciduous molars in children with the age between 5 and 9 years old were carefully selected. The teeth were divided in two groups: Group I partial removal of caries; Group II total removal of caries. Clinical and radiographic evaluations were performed during the period of 4 to 6 months after procedure. The intra-examiner reproducibility was determined by the Kappa test. The exact fisher test was used to determine the statistical difference between the groups. All teeth showed clinical success in the evaluation period of 4 to 6 months. The radiographic evaluation showed 94,2% and 89,6% of success rate in Group I and in Group II, respectively. Radiographic results did not show statistically significant differences between the studied groups (p>0,05). Based on the obtained results to this sample, and according to the applied methodology, the partial removal of the caries showed satisfactory clinical and radiographic results, suggesting that the minimally invasive approach to the removal of dental caries might substitute the total removal of the caries when correctly indicated.
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Damin, Deise Fátima. "Avaliação histológica do tecido pulpar de molares decíduos humanos submetidos à técnica de remoção parcial de dentina cariada." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/143788.
Full textAbstract:
As evidências, até então disponíveis, revelam o sucesso de tipos diferentes de abordagem conservadora de lesões de cárie profundas e as reações do complexo dentino-pulpar, entre elas a formação de dentina reacional. O objetivo do presente estudo foi avaliar histologicamente o tecido pulpar de dentes decíduos humanos submetidos a diferentes abordagens conservadora. A amostra foi composta por 25 molares decíduos, divididos em 5 grupos, sendo os primeiros tratados com remoção total de tecido cariado sem exposição pulpar (RTTC), remoção parcial de tecido cariado em sessão única (RPTC) e tratamento expectante (TE), além dos controles positivo (molares hígidos) e negativo (molares com lesão de cárie ativa profunda em dentina sem tratamento restaurador). Foi realizada a quantificação de dentina reacional, da presença ou não de inflamação e reabsorção pulpar e uma análise descritiva da morfologia pulpar através da observação de cada lâmina ao microscópio. Não foi encontrada diferença estatisticamente significativa entre os grupos, entretanto houve maior formação de dentina reacional no grupo de RPTC, nos levando a entender que o tratamento menos invasivo pode ser uma alternativa terapêutica definitiva para o tratamento das lesões profundas de cárie em dentina de dentes decíduos.The evidence available so far shows the success of the conservative approach of deep carious lesions and the reactions of the pulp-dentin complex, including the formation of reactionary dentin. The aim of this study was to evaluate histologically the pulp tissue of human deciduous teeth undergoing different conservative treatments. The sample was composed of 25 primary molars, divided into 5 groups, the first being treated with total caries removal without pulp exposure (TCR), partial caries removal in one session (PCR) and stepwise excavation (SW), and positive controls (sound molars) and negative (molars with active deep caries lesion without restorative treatment). Quantification of reactive dentin was performed, the presence or absence of resorption and inflammation and pulp descriptive analysis of the morphology of pulp through observation of each slide under a microscope. There was no statistically significant difference between the groups, but there was more reactionary dentin formation in PCR group, leading us to understand that the less invasive treatment may be an alternative therapy for the definitive treatment of deep caries lesions in dentin of deciduous teeth.
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Silva, Mateus Rodrigues. "Avaliação da irradiação do Nd:YAG laser sobre esmalte dental, associada ou não a um fotoabsorvedor, na redução da desmineralização por cárie artificial /." São José dos Campos, 2018. http://hdl.handle.net/11449/180451.
Full textAbstract:
Orientador: Sérgio Eduardo de Paiva GonçalvesBanca: Ricardo Scarparo Navarro
Banca: Taciana Marco Ferraz Caneppele
Resumo: O objetivo deste estudo foi avaliar a eficácia de diferentes parâmetros de energia do Nd:YAG laser, associados ou não a um fotoabsorvedor na redução da desmineralização por cárie artificial, sobre a superfície de esmalte dental. De coroas de incisivos bovinos foram obtidos 80 espécimes circulares com 6 mm de diâmetro e 2 mm de altura (1 mm de esmalte e 1 mm de dentina), o esmalte foi polido com lixas de carbeto de silício. Em cada espécime foi delimitada uma metade na qual o esmalte ficou exposto. As amostras foram avaliadas em Microdurômetro e FTIR para verificação inicial, e distribuídas de forma aleatória em oito grupos (n=10), que receberam os seguintes tratamentos de superfície sobre o esmalte: G1 (controle negativo): não recebeu tratamento de superfície; G2 (controle positivo): aplicação tópica de fluorfosfato acidulado 1,23% gel por 4 min; G3 (Nd:YAG 60 mJ / pulso, 10Hz, 48 J/cm2, não contato); G4 (fotoabsorvedor + Nd:YAG 60 mJ); G5 (Nd:YAG 80 mJ / pulso, 10Hz, 64 J/cm2, não contato); G6 (fotoabsorvedor + Nd:YAG 80 mJ); G7 (Nd:YAG 100 mJ / pulso, 10Hz, 80 J/cm2, não contato); G8 (fotoabsorvedor + Nd:YAG 100 mJ). Após os tratamentos as amostras foram submetidas ao ciclo de des-remineralização para indução artificial de cárie, sendo então avaliadas em Interferômetro de luz branca, Microdurômetro e FTIR. Os resultados de microdureza foram submetidos à Análise de variância (ANOVA) sob 2 fatores (laser e fotoabsorvedor); ao teste de Tukey e ao teste de Dunnett, com nível de... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract : The aim of this study was to evaluate the effectiveness of different energy parameters of the Nd:YAG laser, associated or not to a photoabsorber in the reduction of demineralization by artificial caries, on the surface of dental enamel. From the crowns of bovine incisors, 80 circular specimens with 6 mm diameter and 2 mm height (1 mm of enamel and 1 mm of dentin) were obtained, the enamel was polished with silicon carbide sandpapers. In each specimen surface was delimited a half in which the enamel was exposed. The samples were evaluated in Microdurometer and FTIR for initial verification, and randomly distributed in eight groups (n = 10), which received the following surface treatments on the enamel: G1 (negative control): no surface treatment; G2 (positive control): topical application of acidulated fluorophosphate 1.23% gel for 4 min; G3 (Nd:YAG 60 mJ / pulse, 10 Hz, 48 J / cm2, non-contact); G4 (photoabsorber + Nd:YAG 60 mJ); G5 (Nd:YAG 80 mJ / pulse, 10 Hz, 64 J / cm2, non-contact); G6 (photoabsorber + Nd:YAG 80 mJ); G7 (Nd: YAG 100 mJ / pulse, 10 Hz, 80 J / cm2, non-contact); G8 (photoabsorber + Nd:YAG 100 mJ). After the treatments, the samples were submitted to the deremineralization cycle for artificial induction of caries, and were then evaluated in White Light Interferometer, Microdurometer and FTIR. The microhardness results were submitted to Analysis of Variance (ANOVA) under 2 factors (laser and photoabsorber); to the Tukey test and the Dunnett test, with a significance level of 5% ( = 0.05). Statistically significant differences were obtained in the photoabsorber factor individually and in the interaction between the laser and photoabsorber factors. There was a lower percentage of microhardness loss in the photoabsorber groups compared to the non-photoabsorber groups and in the G8 group...(Complete abstract click electronic access below)
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